CVE-2023-4967Network attack vector

Unauthenticated service interruption via buffer handling

Published Oct 27, 2023 · Updated Feb 27, 2025

Buffer-handling flaw in Cloud Software Group NetScaler ADC and NetScaler Gateway allows remote attackers to interrupt service. The vendor identifies an unauthenticated buffer-related error but has not disclosed the affected code locus or the operation performed incorrectly. Exposure requires a customer-managed appliance configured as a VPN, ICA, CVPN, or RDP Gateway, or as an AAA virtual server; service interruption is the only described operational consequence.

CVSS severity8.2
High
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Buffer-handling flaw in Cloud Software Group NetScaler ADC and NetScaler Gateway allows remote attackers to interrupt service. The vendor identifies an unauthenticated buffer-related error but has not disclosed the affected code locus or the operation performed incorrectly. Exposure requires a customer-managed appliance configured as a VPN, ICA, CVPN, or RDP Gateway, or as an AAA virtual server; service interruption is the only described operational consequence.

The record

CVE
CVE-2023-4967
Published
Oct 27, 2023
Updated
Feb 27, 2025
Vendor
Cloud Software Group
Product
NetScaler Gateway
Classifications
CWE-119, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=13.0 <92.19
  2. Affected versionversion=13.1 <49.15
  3. Affected versionversion=14.1 <8.50

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cloud Software Group · NetScaler Gatewayversion=13.0 <92.19; version=13.1 <49.15; version=14.1 <8.50
Cloud Software Group · NetScaler ADCversion=12.1-FIPS <55.300; version=12.1-NDcPP <55.300; version=13.0 <92.19; version=13.1 <49.15; version=13.1-FIPS <37.164; version=14.1 <8.50

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2Citrix Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo